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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits.h>
#include <set>
#include "base/logging.h"
#include "base/platform_file.h"
#include "tools/ipc_fuzzer/message_lib/message_file.h"
#include "tools/ipc_fuzzer/message_lib/message_file_format.h"
#include "tools/ipc_fuzzer/message_lib/message_names.h"
namespace ipc_fuzzer {
namespace {
// Helper class to write a MessageVector + message names to a file.
class Writer {
public:
Writer(const base::FilePath& path);
~Writer();
bool Write(const MessageVector& messages);
private:
bool OpenFile();
// Helper to append data to file_.
bool WriteBlob(const void *buffer, size_t size);
// Collects a set of MessageVector message types. Corresponding message
// names need to be included in the file.
bool CollectMessageTypes();
bool WriteHeader();
bool WriteMessages();
// Each name table entry is a message type + string table offset.
bool WriteNameTable();
// String table contains the actual message names.
bool WriteStringTable();
typedef std::set<uint32> TypesSet;
base::FilePath path_;
base::PlatformFile file_;
const MessageVector* messages_;
TypesSet types_;
DISALLOW_COPY_AND_ASSIGN(Writer);
};
Writer::Writer(const base::FilePath& path)
: path_(path),
file_(base::kInvalidPlatformFileValue),
messages_(NULL) {
}
Writer::~Writer() {
if (file_ != base::kInvalidPlatformFileValue)
base::ClosePlatformFile(file_);
}
bool Writer::OpenFile() {
file_ = base::CreatePlatformFile(
path_,
base::PLATFORM_FILE_CREATE_ALWAYS | base::PLATFORM_FILE_WRITE,
NULL,
NULL);
if (file_ == base::kInvalidPlatformFileValue) {
LOG(ERROR) << "Failed to create IPC message file: " << path_.value();
return false;
}
return true;
}
bool Writer::WriteBlob(const void *buffer, size_t size) {
if (size > INT_MAX)
return false;
const char* char_buffer = static_cast<const char*>(buffer);
int ret = base::WritePlatformFileAtCurrentPos(file_, char_buffer, size);
if (ret != size) {
LOG(ERROR) << "Failed to write " << size << " bytes.";
return false;
}
return true;
}
bool Writer::CollectMessageTypes() {
for (size_t i = 0; i < messages_->size(); ++i) {
uint32_t type = (*messages_)[i]->type();
if (!MessageNames::GetInstance()->TypeExists(type)) {
LOG(ERROR) << "Unknown message type: " << type;
return false;
}
types_.insert(type);
}
return true;
}
bool Writer::WriteHeader() {
FileHeader header;
if (messages_->size() > UINT_MAX)
return false;
header.magic = FileHeader::kMagicValue;
header.version = FileHeader::kCurrentVersion;
header.message_count = messages_->size();
header.name_count = types_.size();
if (!WriteBlob(&header, sizeof(FileHeader)))
return false;
return true;
}
bool Writer::WriteMessages() {
for (size_t i = 0; i < messages_->size(); ++i) {
IPC::Message* message = (*messages_)[i];
if (!WriteBlob(message->data(), message->size()))
return false;
}
return true;
}
bool Writer::WriteNameTable() {
size_t string_table_offset = 0;
NameTableEntry entry;
for (TypesSet::iterator it = types_.begin(); it != types_.end(); ++it) {
if (string_table_offset > UINT_MAX)
return false;
entry.type = *it;
entry.string_table_offset = string_table_offset;
if (!WriteBlob(&entry, sizeof(NameTableEntry)))
return false;
const std::string& name = MessageNames::GetInstance()->TypeToName(*it);
string_table_offset += name.length() + 1;
}
return true;
}
bool Writer::WriteStringTable() {
for (TypesSet::iterator it = types_.begin(); it != types_.end(); ++it) {
const std::string& name = MessageNames::GetInstance()->TypeToName(*it);
if (!WriteBlob(name.c_str(), name.length() + 1))
return false;
}
return true;
}
bool Writer::Write(const MessageVector& messages) {
messages_ = &messages;
if (!OpenFile())
return false;
if (!CollectMessageTypes())
return false;
if (!WriteHeader())
return false;
if (!WriteMessages())
return false;
if (!WriteNameTable())
return false;
if (!WriteStringTable())
return false;
return true;
}
} // namespace
bool MessageFile::Write(const base::FilePath& path,
const MessageVector& messages) {
Writer writer(path);
return writer.Write(messages);
}
} // namespace ipc_fuzzer
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